Create a Wordpress dropdown using a function to change option values to custom taxonomies.

Wordpress Dropdown Categories for Custom Taxonomies

//Wordpress

/*functions.php
Input this function into the functions.php file to call when a dropdown is needed*/

function custom_taxonomy_dropdown( $taxonomy, $orderby = 'slug', $order = 'ASC', $limit = '-1', $name, $show_option_all = null, $show_option_none = null ) {
  $args = array(
    'orderby' => $orderby,
    'order' => $order,
  );
  $terms = get_terms( $taxonomy, $args );
  $name = ( $name ) ? $name : $taxonomy;
  if ( $terms ) {
    printf( '<select name="%s" class="postform">', $name );
    if ( $show_option_all ) {
      printf( '<option value="0">%s</option>', $show_option_all );
    }
    if ( $show_option_none ) {
      printf( '<option value="-1">%s</option>', $show_option_none );
    }
    foreach ( $terms as $term ) {
      printf( '<option value="%s">%s</option>', $term->slug, $term->name );
    }
    print( '</select>' );
  }
}


/*The call to create a custom taxonomy dropdown*/

<?php custom_taxonomy_dropdown($taxonomy, $orderby, $order, $limit, $name, $show_option_all, $show_option_none); ?>


/*Example jQuery to load dropdown option into DOM element*/

$('DOM_Element').bind('change', function(event) {
  event.preventDefault;
  var $pullTaxonomy = $(this).val(); //Pull the taxonomy from the value of the option selected
  var $pullName = $(this).attr('name'); //Pull the taxonomy name from the select menu
  var $pullURL = "<?php bloginfo('url'); ?>/" + $pullName + "/" + $pullTaxonomy;
  if ($pullTaxonomy) {
    $('Dynamic_Load_DOM_Element').load($pullURL);
  }
})